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Platanus × acerifolia
''Platanus'' × ''acerifolia'', London plane, London planetree, or hybrid plane, is a tree in the genus ''Platanus''. It is usually thought to be a hybrid of ''Platanus orientalis'' (oriental plane) and ''Platanus occidentalis'' (American sycamore). Some authorities think that it may be a cultivar of ''P. orientalis''.
==Description==
The London plane is a large deciduous tree growing , exceptionally over tall, with a trunk up to or more in circumference. The bark is usually pale grey-green, smooth and exfoliating, or buff-brown and not exfoliating. The leaves are thick and stiff-textured, broad, palmately lobed, superficially maple-like, the leaf blade long and broad, with a petiole long. The young leaves in spring are coated with minute, fine, stiff hairs at first, but these wear off and by late summer the leaves are hairless or nearly so. The flowers are borne in one to three (most often two) dense spherical inflorescences on a pendulous stem, with male and female flowers on separate stems. The fruit matures in about 6 months, to 2–3 cm diameter, and comprises a dense spherical cluster of achenes with numerous stiff hairs which aid wind dispersal; the cluster breaks up slowly over the winter to release the numerous 2–3 mm seeds.
It shares many visual similarities with ''Platanus occidentalis'' (American sycamore), of which it is derived; however, the two species are relatively easy to distinguish, considering the London plane is almost exclusively planted in urban habitats, while ''P. occidentalis'' is most commonly found growing in lowlands and alluvial soils along streams.〔(【引用サイトリンク】url=http://www.na.fs.fed.us/spfo/pubs/silvics_manual/volume_2/platanus/occidentalis.htm )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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